# std::basic_stacktrace<Allocator>::max_size

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< cpp‎ | utility‎ | basic stacktrace

size_type max_size() const noexcept; |  | (since C++23)

Returns the maximum number of elements the underlying container (typically a std::vector) is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the largest underlying container.

### Parameters

(none)

### Return value

Maximum number of elements.

### Complexity

Constant.

### Notes

This value typically reflects the theoretical limit on the size of the underlying container, at most std::numeric_limits<difference_type>::max(). At runtime, the size of the container may be limited to a value smaller than `max_size()` by the amount of RAM available.

### Example

Run this code

    #include <iostream>
    #include <stacktrace>

    int main()
    {
        std::stacktrace trace;
        std::cout << "Maximum size of a 'basic_stacktrace' is " << trace.max_size() << "\n";
    }

Possible output:

    Maximum size of a 'basic_stacktrace' is 1152921504606846975

### See also

size | returns the number of stacktrace entries (public member function)

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